How to Find Stocks With Big Profits, Fast Growth

Mitchell Rubin of the RiverPark Large Growth Fund likes firms that can rake in cash without putting capital at risk.

It sounds so simple in theory: Only buy businesses that can double earnings over a four- to six-year period, and only do so when they're trading at a great price.

It gets a little trickier in the execution, what with the part about seeing the future. For starters, Mitchell Rubin, portfolio manager of the RiverPark Large Growth Fund (ticker: RPXIX) and his team depend solely on their own research to identify candidates with earnings...